As Zanzibar is nestled just south of the equator, Zanzibar’s climate is very similar to that of Tanzania, although slightly more humid. Generally, the main raining season is between March-May, where afternoon tropical showers are very common and can be heavy.
During the rainy season, the humidity can be very night, with daily temperatures ranging between low to mid 30 degrees Celsius. The long dry season lasts throughout June-October, with temperatures varying depending on altitude and location, however, you can expect clear skies and sunny weather.
There is another short rainy season, between November- December, however, these rains are much lighter and less common, compared to the main rainy season. As for January-February, this is known as the short dry season, ahead of the rains beginning again at the start of March.